Spectrum 590: SW20 Edit
DeleteMeasurement
| Brand |
Reptiles Expert http://www.reptilesexpert.com/ |
|---|---|
| Lamp Product |
UVB MD-Lampe 50 Watt PAR 30 |
| Lamp ID |
SW20 (01/2022) |
| Spectrometer | USB2000+ |
| Ballast | 50W EVG |
| Reflector | |
| Distance | 54.5 cm |
| Age | 90 hours |
| Originator (measurement) | Sarina Wunderlich |
Database entry created:
Sarina Wunderlich
16/Feb/2022 ; updated:
Sarina Wunderlich
16/Feb/2022
Colorimetry
Colorimetry is the science to describe physically the human color perception. The wavelength range 380 nm - 780 nm is visible to humans and detected by three different photoreceptors. Many Reptiles see the range 350 nm - 800 nm and have an additional UV photoreceptor in their retina.
Whereas a spectrometer measures the intensity in every tiny wavelength interval resulting in thousands of individual intensities, the human eye only measures three intensities detected by the three cones. The same is true for the reptile eye with usually three or four photoreceptors. Effectively the detailled spectrum displayed above reduces to a much compacter bar graph displayed below. The photoreceptor sensitivites from these L-Cone, M-Cone, S-Cone, and U-Cone are used, they are chosen as an average of measured reptile photoreceptor sensitivity curves. The bar graph also shows as reference the intensity seen by the three or four photoreceptors for average sunlight (id 1).
From these three numbers the colour coordinate and the correlated colour temperature for humans are calculated using the CIE standard method. I adapted this concept to a "3 cone reptile (M,S,U)" and a "4 cone reptile (L,M,S,U)". I am sure, that this adaption to other colour spaces makes sense mathematically and this is also done in scientific research regarding colour vision of animals, however I have not seen calculation of colour temperatures for other animals in the scientific literature. Even if it is hypothetical, at least this shows, how arbitrary the colour temperature is, and that the colour temperature calculated for humans does not apply to reptiles. The colour spaces also show the colour coordinates of different phases of daylight ((ids 1, 338 – 451, 511 – 513 ), indicated by crosses, coloured in the appriximate colour perceived by a human.
| Human (CIE) | 3 cone reptile | 4 cone reptile | |
|---|---|---|---|
| Cone Excitation | |||
| Colour Coordinate | ( 0.33 ; 0.35 ) | ( 0.22 ; 0.39 ) | ( 0.26 ; 0.16 ; 0.29 ) |
| CCT | 5400 Kelvin | 14000 Kelvin | 7000 Kelvin |
| distance | 0.064 | 0.1 | |
| colour space | 3-D-graph not implemented yet |
Vitamin D3 Analysis
Vitamin D3 is produced by UVB radiation around 300 nm. 7DHC/ProD3 present in the skin is converted to PreD3 when absorbing an UV photon. PreD3 can be converted back to ProD3, to Lumisterol, or to Tachysterol when absorbing another UV photon or can be converted to Vitamin D3 in a warm environment.
This process prevents any overdose of vitamin D3 from UV radiation with a spectrum similar to sunlight. As a comparison the solar spectra at 20°(id:14) and at 85°(id:21) solar angle are shown.
The ratio of the two solarmeters 6.2 (UVB) and 6.5 (UV index) readings has proven a useful and very simply number to acess the spectral shape in the vitamin-d3-active region.
Effective Irradiances
Effective irradiances are calculated for all ranges, actionspectra and radiometers currently present in this database.
The calculation method is a numerical implementation (Simpson's rule) of the formula
To learn more about calculating effective irradiances and radiometers I recommend this excellent report on UVB meters: Characterizing the Performance of Integral Measuring UV-Meters (pdf).
The numbers in the following tables can also be used to estimate certain (effective) irradiances from radiomer readings. Example: If the database lists
- range: UVB (US) = 13.8 µW/cm²
- radiometer: Solarmeter 6.2 = 19.6 µW/cm²
Ranges
total ( 0 nm - 0 nm) 8660 µW/cm² = 86.6 W/m² UVC ( 0 nm - 280 nm) 0 µW/cm² = 0 W/m² non-terrestrial ( 0 nm - 290 nm) 0 µW/cm² = 0 W/m² total2 ( 250 nm - 880 nm) 8640 µW/cm² = 86.4 W/m² UVB (EU) ( 280 nm - 315 nm) 41.6 µW/cm² = 0.416 W/m² UVB (US) ( 280 nm - 320 nm) 50.6 µW/cm² = 0.506 W/m² UVA+B ( 280 nm - 380 nm) 1080 µW/cm² = 10.8 W/m² Solar UVB ( 290 nm - 315 nm) 41.6 µW/cm² = 0.416 W/m² UVA D3 regulating ( 315 nm - 335 nm) 68.3 µW/cm² = 0.683 W/m² UVA (EU) ( 315 nm - 380 nm) 1040 µW/cm² = 10.4 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 88.3 µW/cm² = 0.883 W/m² UVA (US) ( 320 nm - 380 nm) 1030 µW/cm² = 10.3 W/m² UVA1 (variant) ( 335 nm - 380 nm) 973 µW/cm² = 9.73 W/m² UVA1 (medical) ( 340 nm - 400 nm) 1360 µW/cm² = 13.6 W/m² vis. UVA ( 350 nm - 380 nm) 869 µW/cm² = 8.69 W/m² VIS Rep3 ( 350 nm - 600 nm) 6470 µW/cm² = 64.7 W/m² VIS Rep4 ( 350 nm - 700 nm) 7480 µW/cm² = 74.8 W/m² purple ( 380 nm - 420 nm) 1090 µW/cm² = 10.9 W/m² VIS ( 380 nm - 780 nm) 6950 µW/cm² = 69.5 W/m² VIS2 ( 400 nm - 680 nm) 6040 µW/cm² = 60.4 W/m² PAR ( 400 nm - 700 nm) 6190 µW/cm² = 61.9 W/m² tmp ( 400 nm - 1100 nm) 7160 µW/cm² = 71.6 W/m² blue ( 420 nm - 490 nm) 1580 µW/cm² = 15.8 W/m² green ( 490 nm - 575 nm) 1850 µW/cm² = 18.5 W/m² yellow ( 575 nm - 585 nm) 434 µW/cm² = 4.34 W/m² orange ( 585 nm - 650 nm) 1210 µW/cm² = 12.1 W/m² red ( 650 nm - 780 nm) 792 µW/cm² = 7.92 W/m² IRA ( 700 nm - 1400 nm) 972 µW/cm² = 9.72 W/m² IR2 ( 720 nm - 1100 nm) 876 µW/cm² = 8.76 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 3.17 UV-Index Pyrimidine dimerization of DNA 19.9 µW/cm² Photoceratitis 4.8 µW/cm² Photoconjunctivitis 0.143 µW/cm² DNA Damage 0.514 Vitamin D3 11 µW/cm² Photosynthesis 4170 µW/cm² Luminosity 19600 lx Human L-Cone 2920 µW/cm² Human M-Cone 2430 µW/cm² Human S-Cone 1430 µW/cm² CIE X 2610 µW/cm² CIE Y 2740 µW/cm² CIE Z 2460 µW/cm² PAR 29500000 mol photons Extinction preD3 62.3 e-3*m²/mol Extinction Tachysterol 223 e-3*m²/mol Exctincition PreD3 32300 m²/mol Extinction Lumisterol 16 m²/mol Exctincition Tachysterol 332000 m²/mol Extinction 7DHC 18.7 m²/mol L-Cone 2490 µW/cm² M-Cone 1560 µW/cm² S-Cone 2790 µW/cm² U-Cone 2860 µW/cm² UVR - ICNIRP 2004 3.03 Rel Biol Eff Melatonin Supression 1840 µW/cm² Blue Light Hazard 1750 µW/cm² (89.5 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 11.6 µW/cm² Lumen Reptil 21200 "pseudo-lx" Vitamin D3 Degradation 10.5 µW/cm² Actinic UV 2.99 µW/cm² (1.53 mW/klm) Exctincition Lumisterol 20800 m²/mol Exctincition 7DHC 23100 m²/mol Exctincition Toxisterols 5360 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 63.2 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 3.2 Leybold UVB 44.4 µW/cm² Leybold UVA 772 µW/cm² Leybold UVC 0.012 µW/cm² DeltaOhm UVB 103 µW/cm² DeltaOhm UVC 11.4 µW/cm² Vernier UVB 17.2 µW/cm² Vernier UVA 421 µW/cm² Gröbel UVA 859 µW/cm² Gröbel UVB 25.4 µW/cm² Gröbel UVC -0.0139 µW/cm² Luxmeter 20500 lx Solarmeter 6.4 (D3) 10 IU/min UVX-31 147 µW/cm² IL UVB 0.0296 µW/cm² IL UVA 959 µW/cm² Solarmeter 6.5 (UVI, post 2010) 2.42 UV-Index Solarmeter 6.2 (UVB, post 2010) 36.9 µW/cm² (Solarmeter Ratio = 15.2) Solarmeter AlGaN 6.5 UVI sensor 31.3 UV Index GenUV 7.1 UV-Index 1.85 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 84.9 W/m² Solarmeter 4.0 (UVA) 15.5 mW/cm² LS122 (manuf.) 1.4 W/m² ISM400 (first guess) 62.4 W/m² LS122 (assumption) 3.63 W/m² ISM400_new 55.5 W/m² Solarmeter 10.0 (Global Power) (assumption) 79.2 W/m²